Function rustc_middle::ty::print::shrunk_instance_name

pub fn shrunk_instance_name<'tcx>(
    tcx: TyCtxt<'tcx>,
    instance: Instance<'tcx>,
) -> (String, Option<PathBuf>)

Format instance name that is already known to be too long for rustc. Show only the first 2 types if it is longer than 32 characters to avoid blasting the user’s terminal with thousands of lines of type-name.

If the type name is longer than before+after, it will be written to a file.